Mechanism to set the position of a wind turbine rotor blade, at a rotating shaft, has a setting unit with a rotary fluid feed at the shaft working with a feed ring to charge a piston in one of two directions

摘要

The mechanism to apply an active adjustment to the setting of a moving unit (2) at a rotating machine shaft (1), e.g. the position of a rotor blade at a wind turbine, has a setting unit (3) moved by a piston (5) charged by a fluid to move in two directions. The rotary fluid feed (8) to the piston and a backflow (4) from it has a sliding shoe at the rotating shaft surface at one or more angle sectors, working with a feed ring (6) over only one or more sections of its circumference. One section of the rotary feed is linked to the rotating shaft and the other is connected to the stationary part (10) of the machine. The feed ring valve is closed outside the overlap between the shoe and the feed ring and is at least partially open in the overlap. The fluid feed channel (14) to the piston has two parallel branches (19a,19b) to both sides of it, each with an adjustable throttle (18a,18b) and/or the second path is linked to a sump through a non-return valve.